The plan before proceeding down the valley is to survey the valley from the top and to perform a walk-about survey above the spillway.
On Sol 4733 (May 17, 2017), the robotic arm was used to point the Microscopic Imager (MI) up at the sky for some long overdue sky flat calibration images, and in support of the valley surveying objectives a large Navcam panorama was collected.
On Sol 4734 (May 18, 2017) the rover performed a 3-point "dogleg" drive of nearly 180 feet (55 meters) to set up for more survey imaging.
Opportunity moved again on the next sol about 34 feet (10.5 meters) to position for an even better imaging position.
In this location the rover spent the next four sols surveying the region atop the spillway and the valley below with both Pancam and Navcam panoramas. On Sol 4735 (May 19, 2017), an atmospheric argon measurement with the Alpha Particle X-ray Spectrometer (APXS) was also fit into the rover activities.
As of Sol 4738 (May 22, 2017), the solar array energy production was 376 watt-hours with an atmospheric opacity (Tau) of 0.826 and a solar array dust factor of 0.536.
Total odometry as of Sol 4738: 27.86 miles (44.8 kilometers).
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